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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55a84660314b15bf1e9dee523c2cfa04ec0ac258e7ad2d7c6a959527556d56c8' 
  AND token = 'tXZqUoDsSFP0YSG+4xL06Xq+BCEirKbZqTbartvo4Ws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}